Ellipsograph.



PATENTED AUG. 14, 1906 .Nov828,372.

J. W. BECKER.

ELLIPSOGRAPH.

APPLICATION FILED PEB.15. 1906.

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J. W. BECKER.

'ELLIPSOGRAPH.

7 APPLICATION FILED M315. 1906.

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J. W. BECKER. ELLHSOGRAPH.

APPLIOATION FILED P1831 15. 1906.

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J. W. BECKER.

ELLIPSOGRAPH,

APPLICATION FILED FEB.15, 1906.

PATENTED AUG. 14, 1906.

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ELLIPSOGRAPH.

Specification of Letters Patent.

, Patented Aug. 14, 1906.

Application filed February 15, 1906. Serial No. 301,183.

To all whom it may concern Be it known that I, JOHN W. Bncrrnn, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Ellipsographs; and I do declare the following 'to be a full, clear, and exact description of the invention, such as ,will enable others skilled in the art to which i this specification.

This invention relates to new and useful improvements in ellipsographs.

topplan view ofthe instrument.

The object of the invention is to provide an instrument of the above type by which elli see of varying diameters may be described, a so lines parallel to an ellipse;

Referring to the drawings, Figure 1 is a Fig. 2 is, a side elevation. Fig. 3 is an end elevation. Fig. 4 is a detail of the sliding block. Fig. 5 is a diagram-showing the relation. of'parallel lines and elliptical lines.

In a detail description of the invention similar reference characters indicate the same parts in the several views.

1 designates the base, which is of suitable weight to steady the instrument, and 2 designates the upper framework. Between the two upright posts of said frame there is mounted a swinging ring or frame 3 on pivots 4, one of said pivots having a thumb-nut 5, by which the ring is fastened and held at any angle. Upon the ring or frame 3 there is a suitable number of supporting-lugs 6, which support a revolving ring or frame 7 by projecting the lugs 6 into the peripheral oove of said ring or frame. Thering 7 is provided with parallel webs 9 on opposite sides, which support a sliding frame 10. The connection between the webs 9 and the frame 10 is by means of screws 11, which are loosened-when the position of said frame is set to the desired point, as presentlymore fully described. The ring or frame 7 is rotated .in describingv lines by means of gearteeth on the under side thereof, which are engaged by a gear 16 on shaft 17. Said shaft 17 is supported upon the swinging ring or frame 3 by a bracket 18. The shaft 17 and gear 16 are rotated by a crank 19, thereby rotating the ring or frame 7.' Pivoted between the ends of the frame 10 is a crossframe 12, which pivotally supports at its center a block 13.

13 designates the pivots between the block 13and frame 12. (See Fig. 4.)

It will be understood that the cross-frame 12 and block 13 have opposite pivotal movements. Passing loosely through the block 13 is a vertical bar 14, upon which said block slides when the ring 7 is rotated, as hereinafter. described. The vertical bar 14 is supported. above and below by arms 20, to the inner ends ofwhich it has pivotal connections 21. The outer ends of-said arms 20 are rigidly secured to a yoke 22, which stiflens or braces said arms. The arms 20 are also pivoted at 23 to a frame 24, whichis pivotally mounted on one side of the main frame 2. When the ring 7 set at the angle shown in Fig; 3 and is rotated, the block 18 will travel in a circle with reference to the center of said ring and will also travel at the same time in an elliptical line with reference to the plane of the table upon which the instrument is placed. The vertical bar 14, passing through said block, is always maintained in a Qee described.

Referringto the diagram shownin Fig. 5, y y represent the major axis, and w 00 the minor axis, of an ellipse. c d designate true elliptical lines, which are not parallel lines at all points, owing to their being trueellipses, as is well known. The innerline eus a true parallel line with the outer line 0. This is due to the fact that said inner line 6 is not a true elliptical line. Such lines 6 can be draWn-bythe present instrument as well as the lines a and d. The lines a, it will be observed, are at right angles to,tlie outer ellipse c and are also at right angles to the parallel or gage line a. The pencil-beam 26, it may be stated, always occupies a position at rightangles to the elliptical line being described by the instrument. Therefore a line parallel to said elliptical line may-be drawn, as shown in Fig. 5, by shifting the pencilholder 27 on the beam 26 to positions on either side of the vertical bar 14. .The diagram at a illustrates the position of the pencil-beam 26 at any point of itsmovement, it being always at right angles to the line of the curve. In setting the instrument to describe an ellipse, the pencil-beam 26 is moved on the line of the major axis by rotating the ring or frame 7. The frame is shifted to bring the pencil on the desired point of the major axis and is then tightened by the screws 11. The ring or frame .7 is further revolved to the position of the minor axis, and the ring or frame 3 is tilted to bring the pencil-point in contact with the point of the minor axis. The thumb-nut 5 is tightened to secure the ring3, and the inner ring or frame 7 is rotated to describe the complete ellipse. In order to obtain parallel lines, the pencil-holder 27 is shifted in'or out.

Having described my invention, I claim 1. In an ellipsograph, a tilting-frame, a revolving frame mounted thereon, a slidable frame within said revolving frame, a crossframe pivotally mounted at its ends in said slidable frame, a hollow block pivoted on said cross-frame, a vertical bar passing through said block and upon which saidblock slides, and means for supporting said vertical bar.

2. In an ellipsogra h, a tilting frame, a revolving frame carrie onsaid tilting frame, a slidable frame within said revolving frame, a cross-frame pivoted on saidslid'able frame, a vertical bar, means for maintaining said vertical bar. at a fixed point from the center'of the revolving frame when the latter is roframe, a vertical bar projected through said revolving frame, means for maintaining said vertical bar at a fixed'point from the center of the revolving frame when said frame is rotated, a beamadjustably connected to said vertical bar, and a pencil-holder on said' beam. 7

5. In an ellipsograph, avertical bar, means for maintaining said vertical bar 1n an upright position, means for compelling said vertical bar to travel in the path of an ellipse, a horizontal cross-beam on the lower end of said vertical bar, and a pencil-holder adjustably mounted on said beam.

6. In an ellipsograph, a tilting frame, a revolving frame within said tilting frame, a sliding frame mounted in said revolving frame, a cross-frame pivoted at its ends in said sliding frame, a vertical bar controlled by said sliding frame, cross-frame, and said revolving frame'in the movement of the latter, a cross-beam-snpporting a pencil at the lower end of said'vertical bar.

In testimony whereof I aflix my signature in presence of two witnesses. j

i JOHN W. BECKER.

Witnesses:

' R. J. MCCARTY, C. M. HEABOLD. 

